Disintegrating head



ly 2 1946. M. c. RAWSQN 2 403,193

DISINT'EGRATI-NG HEAD Filed Feb. 10, 1944 H U l l hl b l l l I l H "I lW Hu l I INVENTOR. flamed 6T Eawaon, BY I Patented July 2, 1946 j,,UNITED STATES PATENT OFFICE DISINTEGRATING HEAD Maxwell 0. Rawson, DesPlaines, 111.

Application February 10, 1944, Serial No. 521,805

4 Claims. 1

The object of this invention is to provide an improved disintegratinghead which is capable of reducing various materials into powder, flakeor granular form of any desired fineness, at a high rate of speed, andwithout clogging of the head. The new head will operate with equalefficacy on such widely divergent materials as leather, rubber, wood,soap, .gelatine, resins and gums.

While the foregoing statements are indicative in a general way of thenature of the invention, other more specific objects and advantages willbe apparent to those skilled in the art upon a full understanding of thenovel construction of the improved disintegrating head.

A preferred embodiment of the invention is presented herein for thepurpose of exemplification, but it will of course be appreciated thatthe invention is susceptible of incorporation in other structurallymodified forms coming equally within the scope of the appended claims.

In the accompanying drawing:

Fig. l is a fragmentary side view of a machine equipped with adisintegrating head constructed in accordance with the invention;

Fig. 2 is a partially sectioned face view of the head; and

Fig. 3 is a fragmentary section taken on the line 3-3 of Fig. 2.

The machine ShOWn in Fig. 1 of the drawing includes a disintegratinghead l which is mounted on a shaft II and is rotated by a pulley l2 onone end of the shaft. The shaft l l is journaled in suitable bearings ina housing l3 which is shaped to provide a hood l4 for the head. Thematerial which is to be reduced is fed toward the head I!) on aninclined work support [5 at the front end of the machine, and theresulting finely divided particles are directed by the hood l4 into acompartment IS in the base of the machine.

The invention resides primarily in the novel construction of the cuttingsurface of the head ID. The head l0which is shown in detail in Fig.2-consists of a metal cylinder H which is supported concentrically ofthe shaft II on end disks l8. The outer surface of the cylinder [1 isprovided with a helical groove l9 of rectangular cross section whichextends continuously in a large number of closely spaced turns from oneend of the cylinder to the other. The groove I9 contains a snuglyfitting saw blade 20 which is curved edgewise to conform to thecurvature of the groove and is connected at its ends to the ends of thecylinder by screws 2| or other fastening v means.

The blade 20 projects outwardly from the outer ized by teeth 22 andintervening gullets 23. The

teeth are preferably directed in the intended direction of rotation ofthe cylinder I1, and the gullets are preferably elevated a little abovethe outer periphery of the cylinder, all as shown in Fig. 3. While thesize and design of the teeth and gullets, and the lateral spacing of theconvolutions of the blade, can be varied considerably, excellent resultshave been obtained by using a blade which is. about inch in height andabout 3 5 inch in thickness, and by employing teeth which are spacedapart about inch and gullets which extend to a depth of about A; inch,seating the band in a groove which is about A; inch deep.

A disintegrating head constructed in accordance with the presentinvention will reduce the material acted upon to any desired degree offineness, depending upon the rate of speed at which the material is fedto the head and also the rate of speed of the head. The cutting surfaceof the head will not clog, and the line particles produced will bethrown free of the head into the receptacle provided for the receipt ofthe same.

I claim:

1. A disintegrating head, comprising a cylinder provided in its outerperiphery with a helical groove which extends continuously from one endof the cylinder to the other in a large number of closely arrangedconvolutions, and a saw blade positioned in the groove with the teeth ofthe blade projecting outwardly from the surface of the cylinder and withthe bottoms of the gullets between the teeth disposed closely adjacentsaid surface, said blade being curved edgewise in conformity with thecurvature of the groove and being secured at its ends to the ends of thecylinder.

2. A disintegrating head, comprising a cylinder provided in its outerperiphery with a helical groove which extends continuously from one endof the cylinder to the other in a large number of closely arrangedconvolutions, and a saw blade positioned in the groove with the teeth ofthe blade projecting outwardly from the surface of the cylinder, saidblade being curved edgewise in conformity with the curvature of thegroove and being secured at its ends to the ends of the cylinder, theteeth of the blade being directed in the direction of rotation of thecylinder, and the bottoms of the gullets between the teeth beingdisposed ouwardly of but closely adjacent the outer periphery of thecylinder.

3. In a reduction machine, a rotatable disintegrating head having acutting surface formed by a 1 series of teeth arranged in helicallydisposed convolutions with the teeth directed in the direction 1 ofrotation, and a support across which the mate- 'rial to be reduced isadapted to be advanced into engagement with the head, said support beingdirected toward the head at an obtuse angle to the surface of the latterin the direction in which n the surface is moving.

4. In areduction machine, a rotatable disinte- 3 grating head having acutting surface formed by a series of teeth'arranged in heli'call'ydisposed MAXWELL c; RAWSON.

